The singer will play London's Proud club in Camden on June 13 as part of Music Week's 'Breakout' season.
The 21-year-old will headline the event, which also includes performances from ME, Last Dinosaurs and Poppy & The Jezabels.
Grimshaw recently unveiled his debut single 'Is This Love', which is available to download on June 3. His album Misty Eye follows on August 13.
The former X Factor contestant recently released a remix of his latest track, which is available for free for seven days only.
Tickets for the gig, which cost £6 (£5 after 10.30pm), are available now.
Watch the 'Is This Love' music video below: